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The structural characteristics of tillers with different ages of deferred and fertilized marandu palisade grass (Urochloa brizantha cv. Marandu) were evaluated. Two doses of nitrogen (low, 50 kg ha and high, 200 kg ha), three age categories of tillers (young, <2 months, mature, 2 to 4 months, and old,> 4 months), and to two periods (beginning, 1 to 45 days and end, 46 to 90) during deferral were 2 CARVALHO, A.N. et al. Cienc. anim. bras., Goiânia, v.20, 1-12, e-44460, 2019 evaluated. The experimental design was completely randomized, in a subsubdivide plot scheme, with four replications. In general, young tiller had a better morphological composition (40.0% live leaf, P=0.0074; 39.2% live stem, P=0.0208; and 20.8% dead leaf blade, P=0.0155), while the old tiller had a worse morphology (7.3% live leaf, 54.8% live stem and 38.0% leaf dead) at the end of the deferral period. The percentage of old tillers was higher (P=0.0019) at the end (54.0%) than at the beginning (43.4%) of the deferment period. At the beginning of the deferment the canopy fertilized with high dose of N presented (P=0.0447) a higher percentage of young tiller (36.8%) than that under low N dose (28.6%). At the end of the deferment period, both the high and the low nitrogen doses resulted (P=0.0276) in similar values of young tiller in the deferred canopy (24.3%, on average). The higher N dose, plotted before the deferral period, increases the percentage of young tiller during the initial phase of deferment. Young tiller has better structural characteristics than mature and old tiller.

COMO A IDADE DO PERFILHO E A ADUBAÇÃO NITROGENADA MODIFICAM AS CARACTERÍSTICAS ESTRUTURAIS DO CAPIM-MARANDU DIFERIDO?